class util:
    def convert_encoding_bulk(input_file, output_file, input_encoding='gbk', output_encoding='utf-8'):
        with open(input_file, 'r', encoding=input_encoding) as f_in:
            content = f_in.read()

        with open(output_file, 'w', encoding=output_encoding) as f_out:
            f_out.write(content)
